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    • 49. 发明授权
    • Method and apparatus for a carrier frequency control in a wireless communication system
    • 无线通信系统中载波频率控制的方法和装置
    • US06603958B1
    • 2003-08-05
    • US09500458
    • 2000-02-09
    • Shiwei GaoGenzao G. ZhangKuang-Tsan Wu
    • Shiwei GaoGenzao G. ZhangKuang-Tsan Wu
    • H04B110
    • H04L27/0014H04L2027/002H04L2027/0022
    • The invention provides a frequency control method and apparatus for efficiently controlling in a wireless system the carrier frequency of a received signal transmitted over a radio link to counteract carrier frequency drifts in the received signal and hence maintain link connectivity. In a preferred embodiment, the invention provides upstream and downstream carrier frequency control in a broadband wireless access (BWA) time division multiplex access (TDMA) system formed of a base transceiver station (BTS) and multiple customer premises equipment (CPE) units. At each of the CPE units, the CPE upstream carrier frequency is preemptively adjusted based on downstream carrier frequency measurements to counteract carrier frequency variations in the upstream carrier frequency. For downstream communications, the BTS periodically polls all active CPE units to obtain downstream frequency offset estimates, calculate a frequency correction offset and adjust the downstream carrier frequency accordingly.
    • 本发明提供了一种频率控制方法和装置,用于在无线系统中有效地控制通过无线电链路发射的接收信号的载波频率,以抵消载波频率在接收信号中漂移,从而保持链路连通性。 在优选实施例中,本发明在由基站(BTS)和多个客户驻地设备(CPE)单元形成的宽带无线接入(BWA)时分复用接入(TDMA)系统中提供上行和下行载波频率控制。 在每个CPE单元中,CPE上行载波频率基于下行载波频率测量进行抢占式调整,以抵消上行载波频率中的载波频率变化。 对于下游通信,BTS周期性地轮询所有活动CPE单元以获得下行频率偏移估计,计算频率校正偏移并相应地调整下行载波频率。